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diff --git a/slideshow/source/inc/subsettableshapemanager.hxx b/slideshow/source/inc/subsettableshapemanager.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_SLIDESHOW_SOURCE_INC_SUBSETTABLESHAPEMANAGER_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_INC_SUBSETTABLESHAPEMANAGER_HXX
+
+#include "shapemanager.hxx"
+#include "intrinsicanimationeventhandler.hxx"
+#include <memory>
+
+/* Definition of SubsettableShapeManager interface */
+
+namespace slideshow::internal
+    {
+        class DocTreeNode;
+        class AttributableShape;
+        typedef ::std::shared_ptr< AttributableShape > AttributableShapeSharedPtr;
+
+        /** SubsettableShapeManager interface
+
+            Implementers of this interface manage creation and
+            revocation of shape subsets. Shape subsets are shapes that
+            represent (and animate) only parts of an original's shape
+            content.
+         */
+        class SubsettableShapeManager : public ShapeManager
+        {
+        public:
+            /** Query a subset of the given original shape
+
+                This method queries a new (but not necessarily unique)
+                shape, which displays only the given subset of the
+                original one. Calling this method multiple times with
+                the same original shape and DocTreeNode content always
+                returns the same shape.
+
+                Requesting a subset from an original shape leads to
+                the original shape ceasing to display the subsetted
+                content. In other words, shape content is always
+                displayed in exactly one shape.
+
+                @param rOrigShape
+                The shape the subset is to be created for
+
+                @param rSubsetShape
+                The subset to display in the generated shape.
+             */
+            virtual AttributableShapeSharedPtr getSubsetShape(
+                const AttributableShapeSharedPtr& rOrigShape,
+                const DocTreeNode&                rTreeNode ) = 0;
+
+            /** Revoke a previously queried subset shape.
+
+                With this method, a previously requested subset shape
+                is revoked again. If the last client revokes a given
+                subset, it will cease to be displayed, and the
+                original shape will again show the subset data.
+
+                @param rOrigShape
+                The shape the subset was created from
+
+                @param rSubsetShape
+                The subset created from rOrigShape
+             */
+            virtual void revokeSubset(
+                const AttributableShapeSharedPtr& rOrigShape,
+                const AttributableShapeSharedPtr& rSubsetShape ) = 0;
+
+            // Evil hackish way of getting intrinsic animation slide-wise
+
+            /** Register an event handler that will be called when
+                user paint parameters change.
+
+                @param rHandler
+                Handler to call when a shape listener changes
+            */
+            virtual void addIntrinsicAnimationHandler( const IntrinsicAnimationEventHandlerSharedPtr& rHandler ) = 0;
+            virtual void removeIntrinsicAnimationHandler( const IntrinsicAnimationEventHandlerSharedPtr& rHandler ) = 0;
+
+            /** Notify that shape-intrinsic animations are now enabled.
+            */
+            virtual void notifyIntrinsicAnimationsEnabled() = 0;
+
+            /** Notify that shape-intrinsic animations are now disabled.
+            */
+            virtual void notifyIntrinsicAnimationsDisabled() = 0;
+        };
+
+        typedef ::std::shared_ptr< SubsettableShapeManager > SubsettableShapeManagerSharedPtr;
+
+}
+
+#endif // INCLUDED_SLIDESHOW_SOURCE_INC_SUBSETTABLESHAPEMANAGER_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */